Buffing, polishing, and abrading device



June 8, 1948. P. BORG BUFFING, POLISHING, AND ABRADING DEVICE 2 Sheets-Sheet 1 Filed April 15, 1947 Pqa; '5 0P6 BY 14 W June 8, 1948. P. BORG BUFFING, POLISHING, AND ABRADING DEVICE Filed April 15, 1947 2 Sheets-Sheet 2 INVENTOR. fia/Pq P404 BY A TTOQ/VEY-S' Patented June 8, 1948 BUFFIN G, POLISHING, AND ABRADING DEVICE Paul Borg, New York, N. Y. Application April 15, 1947, Serial No. 741,542

5 Claims.

This invention relates to bufling, polishing and abrading devices.

An object of this invention is a portable head for bufling, polishing and abrading devices of such structure that the bufling, polishing or abrading medium may be either supported in such manner as to present a flexible work-engaging face adapted to accommodate itself to surfaces other than flat or may be reinforced to maintain a rigid work-engaging face of predetermined shape.

A further object of this invention is a motordriven portable bufiing, polishing or abrading device which is simple in structure, may be manufactured economically and is highly efiicient in operation.

Other objects, novel features and advantages of this invention will become apparent from the following specification and accompanying drawings, wherein:

Fig. 1 is an elevation partly in section of an embodiment of the invention;

Fig. 2 is a fragmentary rear view of Fig. 1;

Fig. 3 is a sectional view partially in elevation illustrating a modification;

Figs. 4 and 5 are illustrations of details, and

Fig. 6 is a. fragmentary view generally similar to Fig. 3 illustrating an arrangement of parts different from that of Fig. 3.

A tubular handle H! supports a yoke I at one end. A motor I2 is pivotally supported between the arms of the yoke H and is provided with a recess 3 in alinement with the motor axis and with a recess l4 perpendicular to the motor axis. A spring-biased detent I5 is slidably supported by the yoke H and handle ID with a portion projecting through a slot IS in the handle l by means of which the detent may be retracted. With the detent l projecting into the recess I4, the motor axis is at right angles to the handle axis but with the detent l5 projecting into the recess I3, the motor axis is in alinement with the handle. A switch I! is carried by the handle I0 and a flexible conductor "3 connects the motor to the switch while a flexible conductor l9 leads from the switch I! to a suitable electrical fixture 20, by means of which electrical 'power may be supplied from a suitable source to the motor Ill through the switch IT.

A hub 2| of any suitable material is fixed to the shaft 22 of the motor 2 by a set screw 23. A metal disk 24 is attached to the face of the hub 2| adjacent the motor by screws or bolts 25. The diameter of the disk 24 exceeds the diameter 2 e of the inner end of the hub 2| and the disk constitutes a flange for the hub.

The hub 2| is formed with a concave peripheral surface 26 which is enclosed by a pneumatic annulus 21 equipped with an ordinary tire valve 28 extending through the disk 24 by means of which the annulus 21 may be inflated by use of the pump 28 which, when not in use, is stored in the handle Ill. A cover 29 of any material suitable for bufling, polishing or abrading e11 closes the annulus 21 and hub 2!, the cover being formed with an aperture provided atits periphery with a rigid ring 30 interposed between the disk 24 and the annulus 21. The curvature of the surface 26 is such that upon inflation of the annulus 21, the annulus tends first to bind the ring 30 against the disk 24 andthen to expand into contact with the cover 29 as shown in Fig. 1. The dimensions of the annulus 21 are such that when inflated, the cover 29 is spaced from the outer end of the hub 2 I.

In the modification shown in Figs. 3 to 6 in elusive, a circular plate 3| engages the outer face of the hub 2| and is attached to the hubby a bolt or stud 32 extending into a tapped aperture 33 in the hub. The circular plate 3| is'of greater diameter than the outer end of the hub so that in effect it constitutes a flange for the hub overlying the pneumatic annulus -2|. The plate 3| is formed with a flat face 34 and a convex face 35 either of which may face the cover 29 as shown in Figs. 4 and 6. The plate 3| is provided with a central aperture 36 of the proper diameterto receive the bolt or stud 32 and slots 31 are provided in each face of the plate extending radially from the aperture 36. with radial pins 38 of proper size to be received in the slots 31. By means of the arrangement just described, the plate 3| may be attached to the hub- 3| either as shown in Fig. 3 or as shown in Fig. 6 and present a smooth surface to the cover 29.

The device may be utilized either with the motor axis at right angles to the handle axis as shown in the drawings or with the motor axis parallel to the handle axis. Also, the device may be used with the cover 29 supported solely by the annulus 21 with the cover 29 maintained out of contact with any solid surfaces and free to accommodate itself to the contour of the surface to which it is applied. With the plate 3| attached to the hub 2|, a backing surface is provided for the cover over the central portion thereof. This surface may be either flat or convex according to the way the plate 3| is attached to the hub The stud 32 is provided 2|. With the annulus 21 deflated, the cover 29 is slipped over the annulus to locate the ring 30 adjacent the disk 24. Then, by use of the pump 28, the annulus is inflated, thereby forcing the ring 30 against the disk 24 and expanding it into contact with the cover 29 to support the latter for rotation with the hub 2|. Removal of the cover is effected by deflating the annulus 21, thereby providing clearance between the annulus and the periphery of the cover aperture.

The hub 2| provides the peripheral surface 25 having the radial flange 24, and the penumatic annulus 21 has its inside surface 26 with what is illustrated as its right hand side wall adjacent the flange 24. The cover 29 fits over the annulus 21 and has a closed end, illustrated as the left hand end, radially stretched tautly by inflation of the annulus 21, and an open end, toward the flange 24, peripherally provided with the ring 30 that can be fitted over the annulus 21 when the latter is deflated, but which is of smaller diameter-thanthe outside diameter of the annulus 21 when the latter is inflated. This ring 30 fits between the right hand side wall of the annulus 21 and the flange 24, the latter having a diameter larger than that of the ring 30, and the peripheral surface 26 flares away from the flange 24. This flaring away of thesurface 26 from the flange 24' is very clearly illustrated by the drawings and is the nature of the curvature previously described as causing the annulus ,to bind the-ring against the flange 24. That is to say, with the smaller diameter of the surface 26 toward the flange 24 and the larger diameter away therefrom, inflation of the annulus 21 causes its right hand side wall to grip the ring 30 between it and the flange 24 soas to permit the closed or left hand end of the cover 29 to be radially stretched tautly by the fully inflated annulus.

I claim:

1. A device of the character described comprising a hub having a concave peripheral surface terminating at one end of the hub in a flange perpendicular to the hub axis, a pneumatic annulus surrounding said hub and fitting said concave peripheral surface, a disk attached to the opposite end of said hub in overlapping relation to said annulus and a cover enclosing said disk and said annulus, said cover being formed with an aperture-provided at its periphery with a rigid ring interposed between said annulus and said flange.

periphery engaging this 2. A device according to claim 1 characterized by said disk having a flat urface facing said cover.

3.A device according to claim 1 characterized by said disk having a convex surface facing said cover.

4. A device of the character described comprising a hub having a concave peripheral surface terminating at one end of the hub in a flange perpendicular to the hub axis, a pneumatic annulus surrounding said hub and fitting said concave peripheral surface, a disk at the opposite end of said hub in overlapping relation to said annulus. said disk having one surface flat and the other surface convex, means for attaching said disk to said hub with either surface engaging said hub and a cover enclosing said disk and said annulus, said cover being formed with an aperture provided at its periphery with a rigid ring interposed between said annulus and said flange.

5. A rotary element providing a peripheral surface having a radial flange, a pneumatic annulus having an inside periphery engaging said surface and a side wall adjacent said flange, and a cover fitting over said annulus, said cover having a closed end opposite said flange, with said end radially stretched tautly by inflation of said annulus,'and an open end toward said flange and peripherally provided with a ring that can befitted over said annulus when the latter is deflated but which is of smaller diameter thanthe outside diameter of said annuluswhen the latter is inflated, said ring fitting between .said side wall of said annulus and said flange, the latter having a diameter larger than that of said ring, and said peripheral surface flaring away from said flange so that inflation of said annulus causes its said side wall to grip said ring between it and said flange and permit said closed end of said cover to be radially stretched tautly by said inflated annulus.

PAUL BORG.

REFERENCES CITED The following references are of record in'the file of this patent:

UNITED STATES PATENTS Number Name Date 1,487,256 Mall Mar. :18, 1924 2,108,193 Brackett 'Feb.15, 1938 2,189,472 Peterson Feb. 6, 1940 

